loopcontrol.cpp

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/**********************************************************************
 ** Copyright (C) 2000 Trolltech AS.  All rights reserved.
 **
 ** This file is part of Qtopia Environment.
 **
 ** This file may be distributed and/or modified under the terms of the
 ** GNU General Public License version 2 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ** See http://www.trolltech.com/gpl/ for GPL licensing information.
 **
 ** Contact info@trolltech.com if any conditions of this licensing are
 ** not clear to you.
 **
 **********************************************************************/
// L.J.Potter added changes Fri 02-15-2002


#include "mediaplayerstate.h"
#include "loopcontrol.h"
#include "videowidget.h"
#include "audiodevice.h"

/* OPIE */
#include <qpe/qpeapplication.h>
#include <qpe/mediaplayerplugininterface.h>
#include <opie2/odebug.h>

#ifdef Q_WS_QWS
#include <qpe/qcopenvelope_qws.h>
#endif

/* QT */

/* STD */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
#include <unistd.h>


extern VideoWidget *videoUI; // now only needed to tell it to play a frame
extern MediaPlayerState *mediaPlayerState;


//#define DecodeLoopDebug(x)  qDebug x
#define DecodeLoopDebug(x)


static char     *audioBuffer = NULL;
static AudioDevice  *audioDevice = NULL;
static bool     disabledSuspendScreenSaver = FALSE;
static bool     previousSuspendMode = FALSE;


pthread_t audio_tid;
pthread_attr_t  audio_attr;
bool threadOkToGo = FALSE;


class Mutex {
public:
    Mutex() {
        pthread_mutexattr_t attr;
        pthread_mutexattr_init( &attr );
        pthread_mutex_init( &mutex, &attr );
        pthread_mutexattr_destroy( &attr );
    }

    ~Mutex() {
        pthread_mutex_destroy( &mutex );
    }

    void lock() {
        pthread_mutex_lock( &mutex );
    }

    void unlock() {
        pthread_mutex_unlock( &mutex );
    }
private:
    pthread_mutex_t mutex;
};


void *startAudioThread( void *ptr ) {
    LoopControl *mpegView = (LoopControl *)ptr;
    while ( TRUE ) {
        if ( threadOkToGo && mpegView->moreAudio )
            mpegView->startAudio();
        else
            usleep( 10000 ); // Semi-buzy-wait till we are playing again
    }
    return 0;
}


Mutex *audioMutex;


LoopControl::LoopControl( QObject *parent, const char *name )
        : QObject( parent, name ) {
    isMuted = FALSE;
    connect( qApp, SIGNAL( volumeChanged(bool) ), this, SLOT( setMute(bool) ) );
    //odebug << "starting loopcontrol" << oendl;
    audioMutex = new Mutex;

    pthread_attr_init(&audio_attr);
#define USE_REALTIME_AUDIO_THREAD
#ifdef USE_REALTIME_AUDIO_THREAD
      // Attempt to set it to real-time round robin
    if ( pthread_attr_setschedpolicy( &audio_attr, SCHED_RR ) == 0 ) {
        sched_param params;
        params.sched_priority = 50;
        pthread_attr_setschedparam(&audio_attr,&params);
    } else {
       //        odebug << "Error setting up a realtime thread, reverting to using a normal thread." << oendl;
        pthread_attr_destroy(&audio_attr);
        pthread_attr_init(&audio_attr);
    }
#endif
    //odebug << "create audio thread" << oendl;
    pthread_create(&audio_tid, &audio_attr, (void * (*)(void *))startAudioThread, this);
}


LoopControl::~LoopControl() {
    stop();
}


static long prev_frame = 0;
static int currentSample = 0;


void LoopControl::timerEvent( QTimerEvent *te ) {

    if ( te->timerId() == videoId )
        startVideo();

    if ( te->timerId() == sliderId ) {
        if ( hasAudioChannel && !hasVideoChannel && moreAudio ) {
            mediaPlayerState->updatePosition( audioSampleCounter );
        } else if ( hasVideoChannel && moreVideo ) {
            mediaPlayerState->updatePosition( current_frame );
        }
    }

    if ( !moreVideo && !moreAudio ) {
        mediaPlayerState->setPlaying( FALSE );
        mediaPlayerState->setNext();
    }
}


void LoopControl::setPosition( long pos ) {
    audioMutex->lock();
//    odebug << "Loop control " << pos << "" << oendl;
    if ( hasVideoChannel && hasAudioChannel ) {
        playtime.restart();
        playtime = playtime.addMSecs( long((double)-pos * 1000.0 / framerate) );
        current_frame = pos + 1;
        mediaPlayerState->curDecoder()->videoSetFrame( current_frame, stream );
        prev_frame = current_frame - 1;
        currentSample = (int)( (double)current_frame * freq / framerate );
        mediaPlayerState->curDecoder()->audioSetSample( currentSample, stream );
        audioSampleCounter = currentSample - 1;
    } else if ( hasVideoChannel ) {
        playtime.restart();
        playtime = playtime.addMSecs( long((double)-pos * 1000.0 / framerate) );
        current_frame = pos + 1;
        mediaPlayerState->curDecoder()->videoSetFrame( current_frame, stream );
        prev_frame = current_frame - 1;
    } else if ( hasAudioChannel ) {
        playtime.restart();
        playtime = playtime.addMSecs( long((double)-pos * 1000.0 / freq) );
        currentSample = pos + 1;
        mediaPlayerState->curDecoder()->audioSetSample( currentSample, stream );
        audioSampleCounter = currentSample - 1;
    }

    audioMutex->unlock();
}


void LoopControl::startVideo() {

    if ( moreVideo ) {

        if ( mediaPlayerState->curDecoder() ) {

            if ( hasAudioChannel && !isMuted ) {

                current_frame = long( playtime.elapsed() * framerate / 1000 );

                if ( prev_frame != -1 && current_frame <= prev_frame )
                    return;

            } else {
                  // Don't skip
                current_frame++;
            }

            if ( prev_frame == -1 || current_frame > prev_frame ) {
                if ( current_frame > prev_frame + 1 ) {
                    mediaPlayerState->curDecoder()->videoSetFrame( current_frame, stream );
                }
                moreVideo = videoUI->playVideo();
                prev_frame = current_frame;
            }

        } else {

            moreVideo = FALSE;
            killTimer( videoId );

        }

    }
}


void LoopControl::startAudio() {

    audioMutex->lock();
    if ( moreAudio ) {

        if ( !isMuted && mediaPlayerState->curDecoder() ) {

            currentSample = audioSampleCounter + 1;

//              if ( currentSample != audioSampleCounter + 1 )
//                  odebug << "out of sync with decoder " << currentSample << " " << audioSampleCounter << "" << oendl;

            long samplesRead = 0;
            bool readOk=mediaPlayerState->curDecoder()->audioReadSamples( (short*)audioBuffer, channels, 1024, samplesRead, stream );
            long sampleWeShouldBeAt = long( playtime.elapsed() ) * freq / 1000;
            long sampleWaitTime = currentSample - sampleWeShouldBeAt;

// this causes drop outs not sure why its even here
         if ( hasVideoChannel ) {
           if ( ( sampleWaitTime > 2000 ) && ( sampleWaitTime < 20000 ) ) {
         usleep( (long)((double)sampleWaitTime * 1000000.0 / freq) );
           }
         else if ( sampleWaitTime <= -5000 ) {
            //        odebug << "need to catch up by: " << -sampleWaitTime << " (" << currentSample << "," << sampleWeShouldBeAt << ")" << oendl;
 //       //mediaPlayerState->curDecoder()->audioSetSample( sampleWeShouldBeAt, stream );
        currentSample = sampleWeShouldBeAt;
          }
}

            audioDevice->write( audioBuffer, samplesRead * 2 * channels );

            if(  mediaPlayerState->isStreaming == FALSE)
                audioSampleCounter = currentSample + samplesRead - 1;

            moreAudio = readOk && (audioSampleCounter <= total_audio_samples);

        } else {

            moreAudio = FALSE;

        }

    }

    audioMutex->unlock();
}


void LoopControl::killTimers() {

    audioMutex->lock();

    if ( hasVideoChannel )
        killTimer( videoId );
    killTimer( sliderId );
    threadOkToGo = FALSE;

    audioMutex->unlock();
}


void LoopControl::startTimers() {

    audioMutex->lock();

    moreVideo = FALSE;
    moreAudio = FALSE;

    if ( hasVideoChannel ) {
        moreVideo = TRUE;
        int mSecsBetweenFrames = (int)(100 / framerate); // 10% of the real value
        videoId = startTimer( mSecsBetweenFrames );
    }

    if ( hasAudioChannel ) {
        moreAudio = TRUE;
        threadOkToGo = TRUE;
    }

    sliderId = startTimer( 300 ); // update slider every 1/3 second

    audioMutex->unlock();
}


void LoopControl::setPaused( bool pause ) {

    if ( !mediaPlayerState->curDecoder() || !mediaPlayerState->curDecoder()->isOpen() )
        return;

    if ( pause ) {
        killTimers();
    } else {
          // Force an update of the position
        mediaPlayerState->setPosition( mediaPlayerState->position() + 1 );
        mediaPlayerState->setPosition( mediaPlayerState->position() - 1 );
          // Just like we never stopped
        startTimers();
    }
}


void LoopControl::stop( bool willPlayAgainShortly ) {

#if defined(Q_WS_QWS) && !defined(QT_NO_COP)
    if ( !willPlayAgainShortly && disabledSuspendScreenSaver ) {
        disabledSuspendScreenSaver = FALSE;
          // Re-enable the suspend mode
        QCopEnvelope("QPE/System", "setScreenSaverMode(int)" ) << QPEApplication::Enable;
    }
#endif

    if ( mediaPlayerState->curDecoder() && mediaPlayerState->curDecoder()->isOpen() ) {

        killTimers();

        audioMutex->lock();

        mediaPlayerState->curDecoder()->close();

        if ( audioDevice ) {
            delete audioDevice;
            delete audioBuffer;
            audioDevice = 0;
            audioBuffer = 0;
        }

        audioMutex->unlock();
    }
    audioSampleCounter=0;
    current_frame=0;
    total_audio_samples=0;
}


bool LoopControl::init( const QString& filename ) {
    stop();
    audioMutex->lock();

    fileName = filename;
    stream = 0; // only play stream 0 for now
    current_frame = total_video_frames = total_audio_samples = 0;

    //    odebug << "Using the " << mediaPlayerState->curDecoder()->pluginName() << " decoder" << oendl;

      // ### Hack to use libmpeg3plugin to get the number of audio samples if we are using the libmad plugin
//     if ( mediaPlayerState->curDecoder()->pluginName() == QString("LibMadPlugin") ) {
//         if ( mediaPlayerState->libMpeg3Decoder() && mediaPlayerState->libMpeg3Decoder()->open( filename )) {
//             total_audio_samples = mediaPlayerState->libMpeg3Decoder()->audioSamples( 0 );
//             mediaPlayerState->libMpeg3Decoder()->close();
//         }
//     }

    if ( !mediaPlayerState->curDecoder()|| !mediaPlayerState->curDecoder()->open( filename ) ) {
        audioMutex->unlock();
        return FALSE;
    }

    hasAudioChannel = mediaPlayerState->curDecoder()->audioStreams() > 0;
    hasVideoChannel = mediaPlayerState->curDecoder()->videoStreams() > 0;

    if ( hasAudioChannel ) {
        int astream = 0;

        if ( mediaPlayerState->curDecoder()->pluginName() == QString("LibMpeg3Plugin") )
            channels = 2; //dont akx me why, but it needs this hack
        else
            channels = mediaPlayerState->curDecoder()->audioChannels( astream );

        //        odebug << "LC- channels = " << channels << "" << oendl;

//        if ( !total_audio_samples )
            total_audio_samples = mediaPlayerState->curDecoder()->audioSamples( astream );

        total_audio_samples += 1000;
        //        odebug << "total samples " << total_audio_samples << "" << oendl;
        mediaPlayerState->setLength( total_audio_samples );

        freq = mediaPlayerState->curDecoder()->audioFrequency( astream );
        //        odebug << "LC- frequency = " << freq << "" << oendl;

        audioSampleCounter = 0;
        int bits_per_sample;
        if ( mediaPlayerState->curDecoder()->pluginName() == QString("LibWavPlugin") ) {
            bits_per_sample =(int) mediaPlayerState->curDecoder()->getTime();
            //            odebug << "using stupid hack" << oendl;
        } else {
            bits_per_sample=0;
        }

        audioDevice = new AudioDevice( freq, channels, bits_per_sample);
        audioBuffer = new char[ audioDevice->bufferSize() ];
        channels = audioDevice->channels();

          //### must check which frequency is actually used.
        static const int size = 1;
        short int buf[size];
        long samplesRead = 0;
        mediaPlayerState->curDecoder()->audioReadSamples( buf, channels, size, samplesRead, stream );
    }

    if ( hasVideoChannel ) {
        total_video_frames = mediaPlayerState->curDecoder()->videoFrames( stream );

        mediaPlayerState->setLength( total_video_frames );

        framerate = mediaPlayerState->curDecoder()->videoFrameRate( stream );
        DecodeLoopDebug(( "Frame rate %g total %ld", framerate, total_video_frames ));

        if ( framerate <= 1.0 ) {
            DecodeLoopDebug(( "Crazy frame rate, resetting to sensible" ));
            framerate = 25;
        }

        if ( total_video_frames == 1 ) {
            DecodeLoopDebug(( "Cannot seek to frame" ));
        }

    }

    current_frame = 0;
    prev_frame = -1;

    connect( mediaPlayerState, SIGNAL( positionChanged(long) ), this, SLOT( setPosition(long) ) );
    connect( mediaPlayerState, SIGNAL( pausedToggled(bool) ), this, SLOT( setPaused(bool) ) );

    audioMutex->unlock();

    return TRUE;
}


void LoopControl::play() {
   //    odebug << "LC- play" << oendl;
    mediaPlayerState->setPosition( 0); //uglyhack

#if defined(Q_WS_QWS) && !defined(QT_NO_COP)
    if ( !disabledSuspendScreenSaver || previousSuspendMode != hasVideoChannel ) {
        disabledSuspendScreenSaver = TRUE;
        previousSuspendMode = hasVideoChannel;
          // Stop the screen from blanking and power saving state
        QCopEnvelope("QPE/System", "setScreenSaverMode(int)" )
            << ( hasVideoChannel ? QPEApplication::Disable : QPEApplication::DisableSuspend );
    }
#endif

    playtime.start();
    startTimers();
}


void LoopControl::setMute( bool on ) {
    if ( on != isMuted ) {
        isMuted = on;
        if ( !on ) {
              // Force an update of the position
            mediaPlayerState->setPosition( mediaPlayerState->position() + 1 );
            mediaPlayerState->setPosition( mediaPlayerState->position() - 1 );
              // Resume playing audio
            moreAudio = TRUE;
        }
    }
}

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